16661056570544 has 20 divisors (see below), whose sum is σ = 32600408961120. Its totient is φ = 8248047806400.

The previous prime is 16661056570517. The next prime is 16661056570559. The reversal of 16661056570544 is 44507565016661.

It is a happy number.

16661056570544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 16661056570544.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5155028264 + ... + 5155031495.

It is an arithmetic number, because the mean of its divisors is an integer number (1630020448056).

Almost surely, 2^{16661056570544} is an apocalyptic number.

It is an amenable number.

16661056570544 is a deficient number, since it is larger than the sum of its proper divisors (15939352390576).

16661056570544 is a wasteful number, since it uses less digits than its factorization.

16661056570544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10310059868 (or 10310059862 counting only the distinct ones).

The product of its (nonzero) digits is 18144000, while the sum is 56.

The spelling of 16661056570544 in words is "sixteen trillion, six hundred sixty-one billion, fifty-six million, five hundred seventy thousand, five hundred forty-four".